( 12 ) 
Bijlage I. 
8 March ’96. 
In haste. 
Dear Professor Onnes. It would be a terrible disaster for Science 
n your country (and universal Science) if the munieipality of Leiden 
succeeded in carrying out any restrictions on your splendid cryogenic 
laboratory and the fine work you are doing. I cannot understand 
such a position. Surely the scientific man is certain to do all in 
his power to avoid accidents and therefore the municipality can 
have full confidence in him. I have answered your questions in a 
hurry as I have to leave London for a few days and have just time 
to catch the post. If I can do anything to help you it will be a 
pleasure to me to act. In the mean time I may say that I have 
made all my experiments with high pressure apparatus before the 
Prince of Wales and the Sister of your queen Dowager the Duchess 
of Albany without the slightest hesitation and no suggestions of 
danger were even suggesled. With kind regards 
yours faithfully 
James Dewar. 
Questions. 
Answers. 
]. Has there ever been made any objection 
to your laboratory from the point of view 
of public security. 
2. How far is the distance from the places 
where your compressed gases are stored 
under pressure from rooms where people 
assembles. 
3. How much H. Power has your engine 
(gasmotor I suppose). 
4. How much ethylene gas have you in store 
in your apparatus when working and how 
much when it does not work. 
5. How many other cylinders with compressed 
gas have you in store or in use, carbonic 
acid included. 
6. Have you ethylene in spirals or reservoirs 
immersed in nitrous oxide. 
1. No. 
2. Immediately below 
and in the actual 
lecture room. 
3. Gas-engine lOOhor- 
sepower. 
4. The cylinders of 
C 2 H 4 60 & 70 lbs. 
5. Large quantities 20 
or 30 bottles. 
6. No spirals used in 
N 2 0. 
