Henri Arnaut de Zwolle(ca.1400, in Zwolle-1466 in Paris)
また、ヴェネツィアの音楽家で器楽に関する重要な論文の著者となった Silvestro di Ganassi dal Fontego(1492-1565)が、1542年に Viola da gambaに関する研究書として出版した”Regola Rubertina”と、1543年刊の”Lettione Seconda”にも、振動比に関して興味深い事柄があらわされています。
Silvestro di Ganassi dal Fontego(1492-1565)
Silvestro di Ganassi dal Fontego(1492-1565)Venice, 1543年頃
Antonio Stradivari made his violins by utilising a thick ca.14 mm wooden mould or ‘form’, to which the four C-bout corner blocks, together with the top and bottom blocks, were lightly glued, and around which the thin lengths of rib were shaped and then strongly glued to the blocks. Simplistically, once all the glue had dried, the ‘garland’ of blocks and ribs could be carefully detached from the inner mould, and the front and back plates could then be attached to the garland to create the soundbox. Although Stradivari’s moulds, made of walnut wood, have varying lengths, widths and proportions, these variations are often by no more than a few millimetres and sometimes the difference between a particular measurement on one mould and the same measurement on another is just one millimetre; for example, the three bout-width measurements of the P mould, and those of the PG mould, are identical, while the body lengths differ by just one millimetre: P mould 343.5 mm; PG mould 344.5 mm (Stewart Pollens’s measurements).
Almost all the moulds bear identifying letters, inked or incised in block capitals: for example, the letters P, S, and T, G, PG, and MB. Because there are so few extant documents known to be written in Stradivari’s hand, it is not certain which, if any, of these mould letters were drawn by him. Some of the moulds have dates, also inked or incised into the surface of the wood: the mould marked SL is dated November 9, 1691 (incised), and one of the two moulds marked S is dated September 20, 1703. The two B moulds are dated June 3, 1692 and December 6, 1692 (both incised), while the PG mould is dated June 4, 1689 (also incised).
弦楽器の音響メカニズムは難解ですが、これらを少し読み解くとすれば‥ まず、上図の点 P が “オールド・ヴァイオリン “の裏板にみられる『 セントラル・ピン 』とほぼ一致するという状況証拠から、点 P を 裏板におけるつりあいの中心点として印されていると考えることができます。
Jacob Stainer ( ca.1617-1683 ) Violin, Absam ( Tirol )
Underneath the parchment covering the center joint of the back of the violin by Jacob Stainer, five marking points are hidden.Their distance from the lower end of the body can be measured precisely.
Gio Batta Morassi( 1934-2018 ) Violin, 1994年
Bass-bar height 14.0mm / Weight of the top plate 81.5g ( including bass bar 4.9g ) Fingerboard 68.0g / Nut 1.0g
Head( after tuning peg holes ) and neck 71.0g
Total neck weight 140.0g
Weight without parts 405.0g ● Weight without chinrest 455.0g
Total weight with chinrest 521.0g
ともあれ、表板設定などにより… 絶不調に陥っていたヴァイオリンを、最良のレスポンスや響きが生じるようにとのことでしたので、私にとって この時の仕事は難問でした。 2021年 Bass-bar height 13.4mm / Weight of the top plate 81.0g ( including bass bar 4.4g )
そして 熟慮の末に、高さ14mmであったバスバーを 高さ13.4mmのものに入れ替え、想定したような性能で仕上げました。2025年 Bass-bar height 14.8mm / Weight of the top plate72.7g ( including bass bar 6.1g )
2025年 November 15, 0:18 Bass-bar height 14.8mm / Arch height 16.0mm / Weight of the top plate72.7g ( including bass bar 6.1g ) It is perpendicular to the surface on the F-hole side.
Joseph Naomi Yokota Cello, Tokyo anno 2025 / Arch height 32.0mm / Bass-bar height 29.6mm Antonio Stradivari Cello, “The Stauffer-ex Cristiani”
VIENNA micro-CT LAB / “Old violin” Antonio Stradivari Cello, “The Stauffer-ex Cristiani”, 1700年
Method book “Violoncell Schule”, 1839年著 / Bernhard Heinrich Romberg ( 1767-1841 ) June 26, 2024 / 12:42 I made a “bass bar” for a violin.
ところで バスバー設定は、外から確認しにくいので演奏者に問題とされることは少ないようですが、2024年にバスバーを製作したこの楽器のように、実際にはヴァイオリンやチェロの不調の原因となっている場合も多いようです。
Charles J. Rufino / Long island, New york : Viola( 402mm ) 2008. Bass-bar height 14.9mm / Bass-bar thickness 6.0mm / Weight of the top plate101.1g / Weight without parts 530.0g ● Weight without chinrest 592.0g
Viola( 402mm ) Bass-bar height 15.0mm / Bass-bar thickness N5.4mm – B5.6mm –E5.5mm / Weight without parts 495.0g
● Weight without chinrest 555.4g これが、2013年12月に “自由ヶ丘ヴァイオリン”において 製作したバスバーです。このビオラは 私が定期整備を担当しており、2026年現在でも良好なレスポンスや響きを発揮しています。
Grand Piano by “BLÜTHNER” Leipzig, 1870年頃Grand Piano by “Maison Erard” Paris, 1891年Grand Piano by “Maison Erard” Paris, 1897年 Grand Piano by “Maison Erard” Paris, 1906年
( Custom-made with the chrysanthemum crest. ) ° Grand Piano by “Erard” Paris, 1914年º Grand Piano by “Erard” Paris, 1914年
● Let’s go back two months. 2020年 Violin, September 25, 2025 / 9:27
I started remodeling on this day. Weight without parts 375.0g 2020年 Violin, September 27, 2025 / 15:26Gio Batta Morassi( 1934-2018 ) Violin, 1994年 Body weight 265.0g ( Weight of the back side body 183.5g ) 2020年 Violin, September 24, 2025 / 18:22 Body weight 239.5g ( Weight of the back side body 156.5g ) 2020年 Violin, September 24, 2025 / 18:46 Fingerboard 70.6g / Nut 1.0g
Head( after tuning peg holes ) and neck 64.7g Total neck weight 136.3g 2025年 Tokyo. October 8, 2025 16:48 Fingerboard 51.0g / Nut 0.6g
Head( after tuning peg holes ) and neck 56.9g
Forged iron nails 3.75g → Neck side( estimated ) 1.5g Total neck weight 110.0g November 16, 2025 / 15:51 Body weight 220.0g ( Weight of the back side body 147.3g )
2025年 Tokyo. The thinnest zone is 2.1mm, and the thickest zone is 3.7mm.November 8, 2025
● 因みに、私が製作したこのバスバーには”仮想交差節”が 6カ所あります。 November 08, 2025 / 11:44 Weight of the top plate72.7g ( including bass bar 6.1g )
● “焼成釘穴”に鍛造鉄釘を埋め込む工程
2025年 Tokyo. November 14, 2025 15:55 / Violin November 14, 2025 20:22 / Weight of forged iron nails 40.8mm-1.6g / 30mm-1.12g / 26.7mm-1.03g Total 3.75gNovember 14, 2025 21:01 November 14, 2025 21:02 November 14, 2025 21:03 November 14, 2025 21:04November 14, 2025 21:06 November 14, 2025 21:06 November 14, 2025 21:13 November 14, 2025 21:14 November 14, 2025 21:20 November 14, 2025 21:21 November 14, 2025 21:22 November 14, 2025 21:24
November 13, 2025 / 11:21 Body weight 220.0g November 17, 2025 / 14:36 Weight ( without parts ) 330.0g November 28, 2025 : Violin completed
Weight without parts 330.0g ● Weight without chinrest 371.1g
November 30, 2025 / 17:47 Total weight 415.6g ( Includes chin rest 46.0g )November 30, 2025 / 17:48
November 30, 2025 17:49
Total weight 415.6g ( 369.6g+Chinrest 46.0g / Dominant strings & 0.26 Gold brokat E )
The 14.8mm bass bar violin was handed over to the violinist on December 2nd. It will then be used next Wednesday ( December 17th ) from 7pm for a concert of Ravel and Debussy sonatas and piano trios. I’m looking forward to enjoying the sound of the violin from my seat in the hall.
December 17, 2025
December 17, 2025 / 13:10
Preparations for the concert begin.
The air conditioner, which has just been turned on, it makes a driving noise.
This year marks the 1,700th anniversary of the Council of Nicaea.
In times of faith crisis, we sing the Nicene-Constantinopolitan Creed to thank God for giving us this wonderful faith.