NO. 3 APPENDIX 295 



wings from tip to tip (h) and total fore and afl length (1), which is provisionally 



fixed at Jl/ = ^ , and the line of thrust is to be not over one-fourtli the way 



from c p 2 to c g 2 . 



Generally speaking the front pair of wings will be fixed in position and the 

 adjustment for balancing made by moving the rear pair. 



The individual weights of all parts checked by lump weighing are to be given 

 by the caretaker (Mr. Huffaker), under the general scheme shown in the note. 

 The work on the aerodromes being divided into two classes, viz.: metal work and 

 all which is not metal, the two in charge of this work (Mr. Reed and Mr. Maltby) 

 are severally responsible for knowing the weight in grammes of any of the parts 

 they have put into their work, giving these weights to Mr. Huffaker, together 

 with any data for filling out the annexed tables,' on his request. 



Until further orders, Mr. Huffaker is charged with the responsibility of 

 seeing that these conditions are met before any aerodrome is boxed, and will keep 

 the record of weights of the aerodromes-and their principal parts as already com- 

 pleted, in a book, to be preserved in your keeping, which will also be arranged to 

 show with signed photographs and descriptions, and with sketches where needed, 

 the condition and weight (as far as constructed) of every aerodrome, and of any 

 new construction of any part, on the first of each month. 



Particular attention is directed to the preceding paragraph, and to the need 

 that evidence of a definite character is to be obtained and preserved of every- 

 thing already done, and being done. 



Without special orders to the contrary, you will not authorize the boxing of 

 any aerodrome which does not, to your knowledge, meet these conditions. 



Each aerodrome is to have the following parts in duplicate or in triplicate: 



2 pairs wings; 

 2 pairs tails ; 



2 pairs light silk covered rudders; 



3 pairs wheels ; 



with any other parts in duplicate or triplicate, which experience has shown to be 

 necessary. 



Mr. Reed will not box any aerodrome t ill a certificate from Mr. Huffaker can 

 be put on the inside cover, with the list of contents, showing what the conditions 

 are as to weight, wing area, power, etc., and the person in the field charged with 

 the duty of launching the aerodrome (at present Mr. Reed), is authorized not to 

 let it go unless he is satisfied that it has a full forty seconds' supply of steam. 



1 These tables were later designated as "Data Sheets." Several copies, with the data duly 

 entered on them, are given in this appendix, and the form which Mr. Langley included in this letter 

 is therefore not repeated here. — Editor. 



