Ceiling hooks were standard with all Aladdin ceiling lamps at least up until 1949.  Extensions were the extra cost option.

All the variations of #1 ceiling extensions required a ceiling hook. #2 and #3 extensions used bolts that screwed them tight against the ceiling.

# 1 Ceiling Extension
(for model 1, 2 & 3)

This extension illustrated here was sold with a model 1 hanging lamp. This extension was manufactured by B&H.  There are a couple versions of the same design with different cut outs along the sides of the canopy.   I do not know if Aladdin used more than one cut out version.

# 1 Ceiling Extension
(for model 4)

Aladdin introduced a new ceiling extension with the model 4 lamp that they would use until the model 7 was introduced in 1917.  For some reason the price lists still referred to this extension as a #1.  Aladdin Knights usually refer to this extension as #1B to differentiate it from the early extension.

The early cross bar is a bent heavy gauge wire and appears to have only been in use in 1912 on model 4 lamps.  The cast crossbar shown below shows up in the literature for 1913 but may have been phased in in 1912.

#1 Ceiling Extension (for model 5 & 6)

The cross bar on the illustrated extension was used on model 5 and 6 hanging lamps until the introduction of the model 7.  It is possible late model 4 lamps also used this cross bar.

The lower left picture shows a ceiling hook that was provided with the extension. It is the pattern illustrated at the top of this page. All #1 extensions were sold with a ceiling hook.

#2 Ceiling Extension (Model 7)

This extension has a cast iron body and was only offered in 1917. It was designed for use on the Aladdin model 7 hanging lamp. The cross bar is an inverted match for the top of the model 7 & 8 hanging frame. Production numbers were high enough that some model 8 hanging lamps were sold with the model 7 extension.

Nickel finish versions were sold on Canadian model 6 hanging lamps that were offered in 1917 (Undated, uninsulated model 6 burner, late style hanger).

Here is the special bolt supplied to mount the #2 ceiling fixture. 

This view shows the head of the attachment bolt that came with the Aladdin #2 ceiling extension.  This extension is nickle plated. Likely sold with a mdoel 6 lamp sold in Canada during model 7 production in the US.

The canopy is cast iron with makes them a lot more sturdy than the thin metal stampings canopies previously used.  They are very prone to rust.

#3 Ceiling Extension for Model 8 only

The Aladdin model 8 was the first to use the #3 ceiling extension. What makes this version unique is that it shares the same crossbar as the #2 ceiling extension and it is brass plated.

# 3 Ceiling Extension
(Models 9 through B)

The #3 extension was offered starting with model 8 hanging lamps and was an option for all hanging lamps through at least 1950. Starting with model 9 a stamped steel crossbar was used.  I have not found a reference to them after a 1950 price list.  This was Aladdin's last ceiling extension as post WW II housing had mostly standardized on 8 foot ceilings. Finish Satin brass, nickel and  oxidized bronze. 

Previous extensions used a friction lock that tended to be finicky.  The 3 extension used locking arms and were a vast improvement over the previous ceiling extension motors.